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Implement %define lr.default_rules.

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Its value describes the states that are permitted to contain
default rules: "all", "consistent", or "accepting".
* src/reader.c (reader): Default lr.default_rules to "all".
Check for a valid lr.default_rules value.
* src/lalr.c (state_lookahead_tokens_count): If lr.default_rules
is "accepting", then only mark the accepting state as
consistent.
(initialize_LA): Tell state_lookahead_tokens_count whether
lr.default_rules is "accepting".
* src/tables.c (action_row): If lr.default_rules is not "all",
then disable default rules in inconsistent states.
* src/print.c (print_reductions): Use this opportunity to
perform some assertions about whether lr.default_rules was
obeyed correctly.
* tests/local.at (AT_TEST_TABLES_AND_PARSE): New macro that
helps with checking the parser tables for a grammar.
* tests/input.at (%define lr.default_rules invalid values): New
test group.
* tests/reduce.at (AT_TEST_LR_DEFAULT_RULES): New macro using
AT_TEST_TABLES_AND_PARSE.
(`no %define lr.default_rules'): New test group generated by
AT_TEST_LR_DEFAULT_RULES.
(`%define lr.default_rules "all"'): Likewise.
(`%define lr.default_rules "consistent"'): Likewise.
(`%define lr.default_rules "accepting"'): Likewise.
This commit is contained in:
Joel E. Denny
2009-04-20 00:55:50 -04:00
parent 72e727f2ec
commit 7254f6a840
8 changed files with 428 additions and 22 deletions
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13
src/tables.c
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@@ -1,7 +1,7 @@
/* Output the generated parsing program for Bison.
Copyright (C) 1984, 1986, 1989, 1992, 2000, 2001, 2002, 2003, 2004,
2005, 2006 Free Software Foundation, Inc.
2005, 2006, 2009 Free Software Foundation, Inc.
This file is part of Bison, the GNU Compiler Compiler.
@@ -30,6 +30,7 @@
#include "getargs.h"
#include "gram.h"
#include "lalr.h"
#include "muscle-tab.h"
#include "reader.h"
#include "symtab.h"
#include "tables.h"
@@ -303,6 +304,16 @@ action_row (state *s)
actrow[sym->number] = ACTION_NUMBER_MINIMUM;
}
/* Turn off default rules where requested by the user. See
state_lookahead_tokens_count in lalr.c to understand when states are
labeled as consistent. */
{
char *default_rules = muscle_percent_define_get ("lr.default_rules");
if (0 != strcmp (default_rules, "all") && !s->consistent)
nodefault = true;
free (default_rules);
}
/* Now find the most common reduction and make it the default action
for this state. */